From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Hemminger <stephen-OTpzqLSitTUnbdJkjeBofR2eb7JE58TQ@public.gmane.org>
Subject: Re: [PATCH 00/10] igb_uio patches
Date: Tue, 10 Jun 2014 13:47:09 -0700
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To: "Carew, Alan" <alan.carew-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
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On Tue, 10 Jun 2014 19:26:08 +0000
"Carew, Alan" <alan.carew-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> wrote:

> One alternative for us is then to take Neil Horman's idea of scanning /sys/bus/pci/devices/<D:B:D.F>/msi_irqs/
> This gives us at least (MSI | MSI-X) | INT-X, however the Virtio specification mentions MSI-X explicitly for determining the correct offset and might not address the underlying problem my patch set was addressing, I have not tried Virtio with MSI.

MSI doesn't work with virtio. pci_enable_msi() returns error. The device
does not report MSI capability.